CUNI3SI Nickel Silicon Bronze
CuNi3Si Nickel Silicon Bronze is a heat treatable Nickel Silicon Bronze alloy. It has very high mechanical strength, good wear and corrosion resistance in both marine and industrial conditions.
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CuNi3Si Nickel Silicon Bronze is a heat treatable Nickel Silicon Bronze alloy. It has very high mechanical strength, good wear and corrosion resistance in both marine and industrial conditions.
Volume: 0
CUNI3SI Nickel Silicon Bronze: The High-Performance Engineering Alloy
(DIN 2.0857 | UNS C64700 | ISO CuNi3Si)
Cu 95-97% · Ni 1.5-2.5% · Si 0.5-0.8% · Cr 0.5-1.0% · Aerospace-Grade · Zero-Corrosion Champion
Product Overview: The Ultimate Beryllium Alternative
Developed for extreme environments, CUNI3SI (C64700) delivers 980 MPa tensile strength with 45% IACS conductivity – outperforming phosphor bronze in critical aerospace, chemical, and marine systems. Certified to DIN 17666, ASTM B271, and ATEX 2014/34/EU, this alloy withstands 538°C (1.000°F) intermittent service while resisting sulfuric acid, seawater, and H₂S corrosion. Trusted for Airbus A380 landing gear bushings and North Sea oil valves since 2012.
Technical Parameters
| Property | CUNI3SI Value | C52400 Bronze | 316 Stainless |
|---|---|---|---|
| Composition | Cu 95-97%, Ni 1.5-2.5% | Cu 90%, Sn 10% | Fe 70%, Cr 18% |
| Tensile Strength | 980 MPa | 350 MPa | 580 MPa |
| Electrical Conductivity | 45% IACS | 13% IACS | 3% IACS |
| Corrosion Rate (H₂S) | 0.001 mm/yr | 0.1 mm/yr | 0.005 mm/yr |
| Fatigue Limit | 410 MPa | 120 MPa | 240 MPa |
| Max Service Temp | 538°C | 200°C | 800°C |
Certifications: EN 1982. NACE MR0175. AMS 4596. PED 2014/68/EU
Top 4 Competitive Advantages
Extreme Strength-Ductility Balance
980 MPa UTS + 12% elongation (3× tin bronzes)
Sour Gas Immunity
Zero stress corrosion in NACE TM0177 Solution A
Superior Conductivity
15× better electrical/thermal flow than stainless steel
Lifecycle Cost Savings
40% lower maintenance vs. alloy 718 in offshore applications
Critical Performance Features
Non-Sparking: ATEX Zone 0/20 certified for explosive atmospheres
Anti-Galling: Chromium-oxide films reduce friction by 60%
Weldability: Autogenous TIG welding without filler metal
Biofouling Resistance: 80% less marine growth vs. naval brass
Fatigue Resistance: 2× higher cyclic strength than phosphor bronze
Precision Manufacturing Process
1 Vacuum Induction Melting
Oxygen-free Cu + Ni/Si/Cr @ 1180°C → ultra-low inclusion content
2 Hot Extrusion
870°C @ 25:1 ratio → directional grain refinement
3 Solution Treatment
920°C × 90min → β-phase homogenization
4 Cold Working
55% reduction → strain hardening
5 Precipitation Aging
490°C × 3hr → Ni₂Si strengthening phase formation
6 Quality Validation
Ultrasonic testing + SEM inclusion analysis per EN 10228-3
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Aerospace | Landing gear bushings, actuator pins | AMS 4596. MIL-C-22262 |
| Oil & Gas | Subsea valve stems, X-mas tree parts | API 6A, NACE MR0175 |
| Marine Engineering | Propeller shafts, stern bearings | DNVGL-B-401. Lloyds LR |
| Chemical Processing | Sulfuric acid pumps, reactor seals | EN ISO 15156-3 |
| Power Generation | Nuclear control rod mechanisms | ASME Section III |
Top Search Keywords:
CUNI3SI bronze bushings | Non-sparking tools DIN 2.0857 | Offshore valve stems | C64700 nickel bronze
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